title: Intrinsic mobility of gaseous cationic and anionic aggregates of ionic liquids.
abstract: Travelling-wave ion mobility mass spectrometry was used to measure the intrinsic mobility of a series of gaseous supra-cation and supra-anion aggregates of several ionic liquids. Close mobilities were observed in a T-wave cell filled with helium at ca. 0.8 mbar for [(DAI)(n+1)(X)(n)](+) (DAI is the 1,3-dialkylimidazolium cation and X is the anion) as compared to the respective anions [(DAI)(n)(X)(n+1)](-) for n=0 to 9. The anomalous behavior reported before in the condensed phase seems therefore to be related to the unique structural organization of pure ionic liquids that provides both polar and non-polar regions with directionality in which the anionic species are more retained than the cationic species in the salt network.
authors.affiliation: ThoMSon Mass Spectrometry Laboratory, Institute of Chemistry UNICAMP, Campinas, SP-13083-970, Brazil.
authors.forename: Priscila M
authors.initials: PM
authors.lastname: Lalli
authors.forename: Yuri E
authors.initials: YE
authors.lastname: Corilo
authors.forename: Gilberto F
authors.initials: GF
authors.lastname: de Sa
authors.forename: Romeu J
authors.initials: RJ
authors.lastname: Daroda
authors.forename: Vanderlea
authors.initials: V
authors.lastname: de Souza
authors.forename: Gustavo H M F
authors.initials: GH
authors.lastname: Souza
authors.forename: Iain
authors.initials: I
authors.lastname: Campuzano
authors.forename: Günter
authors.initials: G
authors.lastname: Ebeling
authors.forename: Jairton
authors.initials: J
authors.lastname: Dupont
authors.forename: Marcos N
authors.initials: MN
authors.lastname: Eberlin